Toms are pretty resilient.. I just don't water as much as I am a bit careful with water restrictions. I haven't had any dramas though in missing some days. Your covers should work well if you're having that curl problem I reckon. If you're worried about Leo going psycho pooch on your shade and plants you could do up a home remedy - Heaps of blended chillis and water .. strain it off and use the liquid to spray over the cover (and it won't hurt the plants but keep the bugs off) .. it's a liquid (and a dried one by the time Leo sniffs it) so Leo won't be ingesting anything as such, but more smelling it as a deterrent to keep away! You'll also do away with any bug problems... cool!
Good luck mate and happy peaceful growing!