Heads up. Carrying these SUPs or a kayak (or long lumber) on a roof rack: The most critical attachment is at the bow and stern. Every 'lost my kayak' incident I've heard of over almost 20 years of kayaking has been because there was no bow and stern tie. Often the whole rack would be yanked off the roof. I can't imagine what would happen to the glass roof in my Model Y if that happened.
I'm looking for ideas about tying an SUP to the roof of my Model Y without the roof rack (I removed it, lowered my range). Best idea so far is a padded sleeve with tie points at the ends. If I can get two points at the frunk and two points at the back, I won't even bother with the middle.
On my Honda Odyssey and Prius V, I opened the hood removed a fender bolt and attached a loop of webbing then put the bolt back in. (Burned a hole with a soldering iron) These have been incredibly secure, and can be tucked in when not used. Webbing is incredibly strong, but don't just grab anything. The cotton stuff isn't strong at all. I just used old NRS straps.