Hey Mike,
Leo is right, ANY router WILL work. It just depends on what you want accomplished. Personally, in my day job I engineer networks for customers in-home entertainment & occasional live show setups. And size isn’t an issue. But, traveling to gigs on a tour. Space is always a premium!
So when my band wanted a rolling live rig, I chose as small, but as powerful as I could get. Mikrotik Hex Ethernet router, which is about the size of a can of sardines & has 4 1gb nics so you can hardwire laptops, controllers, etc. That currently feeds a TPLink outdoor class 2.4g/5g Access Point, mounted to an extra mic stand. As it’s good practice to keep your IEM antennas, Wireless mics, & wireless internet as separated as you can get. Even though interference is rare. It CAN happen with cheaper gear. (Line 6 wireless guitar 2.4g dongles I’m looking at you!)
The key to killing the interference, disable the 2.4g network in your stage AP. It may not reach as far. But, you’re not trying to reach somebodies phone at the back of the venue! As most modern devices like tablets & phones are dual band capable. Ours connects everybody to their wireless in-ear app controls, (including our soundguy, who is sometimes over a hundred feet away) to our stage rig, And most importantly, Ableset! All band members can can trigger an “ableton loop” if they need to…from their phones. Password protected under a hidden SSID of course!
Just to note, be careful with lightkey for DMX control. It can be a resource hog! We learned the hard way. Having to bring a whole separate Mac to run that & our setlist without fail. Another light control option we found is Beam from showsync.
Best of luck!
~Rick