Setup for my suggestion:
My Balance 20X has just under 60 clients on 4 VLANS. In order to service an outbuilding with 2 VLANS I combine them using a Netgear GS105v2, run the combined VLANS over a fiber, then use another GS105v2 to split them apart again and run them on two separate wired networks. Occasionally someone cross-patches the two VLANS in the outbuilding which effectively then results in Inter-VLAN routing , and then devices end up on the wrong VLAN.
Suggestion:
One suggestion that would make the Client List easier to read at a glance when there are a lot of clients would be just to color-code the Client list by subnet, something like I’ve photoshopped below. Some of the rules lists in other parts of the Peplink web interface might also be easier to read if they were color-coded in some way. Ideally one would allow the user to decide what the color coding is based on in a particular list.