A couple of years ago I bought an iBoost Pro D8. This is a directional wi-fi booster and I'm impressed. Last week when away in Wales I was told the wi-fi could be accessed free at the barn which was about 40/50m from the house router. I could not access it, but when another 80/100m away my booster picked it up, and I enjoyed free access in the van on my tablet.
The problem to me is the ethernet cable dangling through the window so I made the hole in the floor I'd been planning to do since last year. You can see this in photo showing suction mounted booster on front window of van.

1 - In the underbed access locker I drilled a 1 1/4" hole working from above and below.
2 - I had planned to use the tube fitting in photo to line the hole but realised I may not get a good fit and so masticed the neck of a thin plastic bottle in place The lip around the neck that was left after cutting the threaded top off stoped the tube from sinking into the hole.
3 - Ideally I would now have used a flanged tank connector for my 32mm access plugs but these are designed form thick plastic water tanks and not a 45 mm thick floor, so plan B was a couple of teak discs with a hole drilled into them for the access plugs.I Araldited these into place with a pair of small brass screws though the sides to stop any possible rotation of the plug if the glue failed.
4 - Teak discs then stainless steel screwed into place, the one under the van bedded in with mastic, the one in the locker dry.
5 - I've sourced a couple of generic rubber O rings for when I drop on the floor and loose the originals and will pad around the cable with abit of cotton wool so no insects can crawl up the cable

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You could also obviously use this method for getting a tv cable into the van if you wanted
The underbed socket is fed from under the sink. This gives me power when needed in the awning and I have a lead that plugs into this and feeds a waterproof socket under the rear of the van if no awning is fitted. I usually leave the plug in circuit tester shown in place so I can check all is well when I hook up on site.

Colin