Was looking again at those large louvered pergolas at Costco...
The feet I assume you would just bolt to the deck surface.. mine is plywood with that vinyl deck stuff on top, I guess my concern would be keeping the waterproof nature of the deck surface, bolting it down puts holes in that. Would some kind of silicone sealant rated for outdoor use be sufficient?
I'd just be afraid that making some kind of weights wouldn't be enough for how windy it can get where I am.