I put a manual circuit breaker between the panel and the controller. The (+) phase wire from the controller to battery bus has a catastrophic fuse.
Those drill-free mounts are made of ABS. I haven't had real good luck with any adhesive and ABS. Besides, if you use them, aren't you going to be gluing them to just the membrane of your roof? I'd suggest to lose your fear of drilling a hole through the roof. I attached fasteners through Eternabond tape and covered the heads with sealant. I then sealed the mount edges to the roof with more sealant.
