Okay now I can wrap my head around what you have going on, actually going to keep these in mind for myself in the future as I do some installs on elevated platforms due to flood/hurricane issues in my area, and while I would probably still pour a pad with some anchors in it for the quicksling, using one of those is easier than pouring a pad with anchors for 4x4's and building a wooden platform. But in your case you have a couple options as I see it, and some of it depends on the size of the pavers, if they are big, like 18x18 or something your might be okay with anchoring the quicksling to those as you originally proposed, If they are smaller, brick style pavers I probably wouldn't go that route though. You could also use a concrete saw to cut out a square in your pavers and pour a nice neat pad with some anchors in it for your quicksling. This is probably the route I would go if I was doing this for a paying customer. You could also see if quicksling offers a precast pad with anchors for the model you have, or get a regular ultralight poured pad and drill and epoxy some anchors. Finally if its for a grow and might not be forever etc you could try bolting the quicksling to one of those abs pads as long as it was good and thick where you drilled and you used some big washers. This might not be the route I would go professionally but is something I would consider doing for myself for sure. I would go that route before just sitting it on some small brick pavers for sure, and it has the added benefit of being pretty lightweight and easy to move in the future if that is a consideration, as it might be for me, AND it leaves the nice paver patio underneath intact. Sorry I cant give you a definitive answer but these kinds of jobs are always sort of on a case by case basis and a balancing act of a bunch of different factors to do the best install for that particular client and situation. Hope this helps, happy to answer any more questions you might have. Also if you go with the precast or abs pad get it at your local hvac supply house, I am sure there is probably somewhere online that ships that stuff but its going to be much cheaper buy to locally.
