You can have as many as you like I believe but your insurance rates would be through the roof should you make numerous claims in a year.
Anyway, if you are looking for a very affordable insurance, I recommend you check the site below to get free quotes and compare premiums between different insurance companies in the US. The website will pull up comparable premiums from the database, that would give you the best insurance quote and decide which one is best for you.
http://www.goodinsurancepolicy.com
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