If I decide to get a lift, I'm sure I am going to face the same problem.
My strategy will be to let the people selling the lift know that unless they can assist me with locating someone locally who can and will install the lift, then there will be NO sale for them. There must be some contractor that does this sort of thing, since every commercial auto repair garage has a lift or three in them. Certainly the owners didn't do them all.
Anyway, welcome to the site!