The top of the trim is 1.043 1-7/16
Yes, they will need to install the strip first, then fit the modules into the strip opening.
We do not believe it will fit in the 1/4" slot.
Yes, a 1/4 inch mat will slip into the slot. The slot is 5/16 inch thick allowing for either laminate or your floor mat to be slid into it to make a neat finish.
The channel is about 3/16" wide (~5 mm). So the 4mm thickness will fit, but may not be water tight.
No only in black
Yes - this is ideal for garage door openings. I have a 2 car garage and yes I just put them right next to each other. Works great.
Not at this time.
The LifeTiles tape goes perfectly with this strip. It is sold separately.
It's rubber so it should be able to bend to a slight curve.