That's the best way to do it, great if you have to keep a vehicle outdoors since it's that much more snug and takes some serious effort for wind to mess up.My brother started a company for that, supreme car covers. He's local to the Orange County area. I have a sample for the RC F and RC 350. It is laser but and has a snug fit. Let me know if you want to test fit or order one.
rinsing/washing your car often helps especially the underbody. I know people that have done this for years without issue. And of course you need to get undercoating done.I have always just put a protective coat on my car and let it rest outside. Try not to park in the sun too much. Avoid driving through salty winter roads in the winter. never bought a car cover.