Campground setup for Balance 2's?

Just purchased 2 Balance 2’s for my campground’s network, is there a best way to configure them for optimum balancing? Right now I have one configured, as best I could figure out, the other will be a backup. I have two 1000mpps WANS, and 3 Cambium Enterprise APs on the ends and middle of campground. They had been working fine with a Cisco RV340 router but it seemed to bog down, so this was reason for the Pep upgrade. We have 45 sites, so potential for 150 devices, this is why the Balance appealed to me. I was also wondering if I should use my second balance to run 1/2 the campground. on one WAN and the other half on the first balance’s single WAN. Thanks.