My 50 person ukulele group has two bass uke players, me and Tom. I sit on one side, he sits on the other. Although we don't play exactly the same licks, we complement each other. It's also a benefit when one of us can't make rehearsal. When we play smaller rehearsals or gigs, we trade off, one plays bass uke, the other ukulele. We've been doing that lately with the group starting to get together again.
Every other Wednesday I play bass in the backyard of one member, he plays uke, and every other Sunday on the big open patio of a local sandwich shop, he plays bass and I play uke. We've also been doing Zoom sessions since covid every Monday afternoon and Thursday morning when we both play bass, but obviously we only hear ourselves and our leader hosting the sessions.