well,
Safelight screwed up my vehicle.
I made their job easier by removing the wipers and ventilation panels before they arrived. Two young kids came out to do the replacement. They didn't even look 18 years old. They clearly had a lot of experience getting the old windshield out. The windshield was designed to rest on two stops at the bottom of the frame and be pressed in to a specific distance from the top of the frame. They used large caulk guns to put a 1.5" tall by 1"wide triangular bead of sealant on the frame, dropped the new windshield in place, and called it good. I asked them about the placement but didn't push the issue.
No problems until the first rain storm months later. My wipers would only touch 50% of the windshield. I tried all types of wiper blades and assemblies, replaced the arms and springs, with no improvement. Safelight said tough luck. Ended up getting it replaced at a local windshield shop, with my personal supervision.
I'd suggest you have a hose or couple of squirt bottles of water you can spray on the windshield and test the wipers before they leave.