1. insurance need to know the plate, your residence address and why you need a car before giving a quote. price depends on many factors, one of them is where you live.
2. find a national wide, fairly big insurance company, like state farm, inform them your residence address change every time; or rent a car and expense the business cost.
3. read the policy line by line, No matter where you drive, make sure it covers your concerns all the time.
You can have a lot of choices, just call the insurance, if you want information, but afraid ....., you can call some other insurance first to get all questions answered, then talk to the one you really want to deal with.