I would check the mice that are compatible with libratbag/Piper. I believe Logitech have a MMO style mouse with 12ish side buttons on the support list but I would need to double check.

With that said, Logitech have been known to use shitty switches in some of their G series mice. I had to resolder my G903 ones, and I took the opportunity to make other modifications (larger battery + glass skates).

I don’t believe these mice support Bluetooth in addition to their proprietary 2.4 protocol either, so that might be a bit of a deal breaker, though I personally am not too keen on BT for wireless peripherals.

I have the Razer Naga and it works reliably well. Though I use the buttons for work-related macros like copy, paste, delete, and screenshot. There is software for Linux called OpenRazer that I hear works well with the Naga mice. My only complaint with the it is that it has RGB and isn’t wireless.

Edit: forgot to mention the main reason I went with the Naga was because they had a left-hand version.

I have a Logitech G602 that works well, other than the middle click button wearing out a couple times on me (maybe I just use it a lot or something). I’m not sure about linux config though.

I personally have the Corsair Scimitar which I like quite a bit but I had to get used to how to hold it. I honestly think that if I were shopping again today I would just go with the Naga. I think that the Naga is a “buy once, cry once” type of purchase. Mice with 6+ side buttons is just a really sparse product category and if you can manage you should try to get a few of these mice in hand and choose based on comfort

Edit: I specifically chose a wired mouse. The battery in my old Naga was so heavy that I ended up taking it out and just using it wired anyways. If you don’t need to be un-tethered, I would avoid wireless but again, that’s personal preference

I’ve been very happy with my Corsair Scimitar Elite. It’s not wireless though, but I use a Razer V3 bungee to keep the cable convenient. I tried Logitech’s cheaper MMO mouse first and it felt cramped, chinsey, and the side buttons felt sharp and jagged. The Scimitar solved all those problems for me. Before that, I used a Logitech G604, which I loved, but the switches failed just after the warranty expired - not an uncommon problem for those Omron switches. Hopefully I have better luck with the Scimitar’s. So far so good.

I’m a windows-using rube, and I know Corsair’s iCue won’t run on Linux because it requires .net, but if you have dual boot or a VM or access to a windows PC, then you can edit profiles in Windows and save them to the mouse hardware. The only thing you’ll miss is auto-changing profiles when you open an application, so be sure to bind a mouse key to switch profiles, and assign RGB that lets you know which profile you’re in. I assume this method would apply to any mouse with hardware profiles.

I prefer wireless mice too, so I also use a M65 Ultra for FPS games. I find myself using the MMO mouse for desktop though, because having page up/down and home/end on the mouse is great.

Here’s the thing about Bluetooth: it’s usually slightly laggy and will often take inconsistent time to connect. It’s generally not great for gaming because of the lag especially. That’s why gaming mice have a usb dongle that uses faster sample rate (Corsair has Slipstream, Logitech has Lightspeed, etc.) I’ve used both of those and they always wake up in <1s. When I switch to a simple Bluetooth mouse for my work laptop, I definitely feel the lag. If you’re short on usb ports, you should have no problems using a wireless mouse dongle on a hub.