I bought a bed rug for my supercrew and the place that sold it installed for free.
A couple questions:
1. Are they all velcro attached?
2. Did you install under plastic edge cover things?

They velcro attached mine and its not under the rails, but not an issue as i have a snug lid.

Just wanted to know how others installed it.

 

Installed one in my supercab last year. Its all installed with the velcro on the floor and all sides and front wall. Its also held in place by the cargo hook front and rear. Mine does go up under the bedrails except for one small area in the very back where I have some wires coming out.

What do you mean by :
2. Did you install under plastic edge cover things?

 

I think he means the bedrails. Take your truck back to your installer and make them install it correctly under the bedrails. I'll bet they did not want to because of your lid. I installed mine under the rails and it looks very clean.

Oh, and yes mine is attached by the velcro at numerous points across the bed.

 

You can tuck it under the bedrails yourself or have the installer do it for you. Yes, velcro attached.