The hardwire version is best installed where it keeps fingers away from it. MH's have in some cases electrical cabinets where it can be safely installed.
I did install one in our 25' FB, but had to attach it on the side of the bed, below the mattress, next to the converter. The wiring is sort of exposed on this—a bad design no matter where it is installed. Although the hardwire version is cheaper, then you have to buy #10 AWG wire and other electrical parts, so you don't save much. I believe only the 50 amp version has the remote. Because I don't easily fit in the space next to the bed and had tools all over the floor taking up more limited space, it was hard to install it. But a lot of trailer maintenance requires small, double jointed people. You need some familiarity with electrical work to do this.
The advantage of installing it inside is that if something happens during a thunderstorm, I don't have to go out in the rain to check it out.
128 seconds seems long, but if you plug it in first thing, then by the time everything else is set up, the power will have been on for quite a while.