Do they also do installation? And if so, are they subcontractors or actual employees of the store?

The connect you with private contractors

To the best of my knowledge they do not install. Would suggest you call. They may have references. Get on Nextdoor to get your best recommendations for a contractor.

Do not know if you Google Angie she will contact you with a subcontractor in you area. Angie does all the background check for you:)