I really hate to knock someone’s set up but something does not look right. I know you do not want to hear that after spending so much $$$. I would have a hard time believing that a WETT certified inspector would pass that installation. Not sure what the cost is to have someone professionally come take a look at it, a WETT inspector or fire marshal maybe? Would be worth the piece of mind if it were me. Do not get the same company to come back until you have another opinion and some research under your belt.