Steel series Rival 500. Highly recommended. I got it specifically because I wanted as many buttons as possible but in an actually ergonomic to press layout vs trying to feel out the numbers in a numpad layout. https://steelseries.com/gaming-mice/rival-500
You can rest your thumb on a spot in the middle that looks like a button but isn’t and you can also lock out the 2 bottom buttons below your thumb with a physical switch if they get in the way
I’ve never had issues like that myself