powerline recommendation

100M reel of connectix cat5e, then modules or jacks. You don't want to be cutting jack sized holes in your house.
 
But if I buy premade cable I'm just running the cable along the wall as I go why would I need just cable? I do have a crimper but I won't be feeding cables though a 5mm hole. It'll be uncoiled until I reach end room which then has connector
 
If you can run a cable to/from where you need to without drilling a single hole then fine, but most people over that distance would need to drill a hole somewhere (especially if going inside >> outside >> inside) and @bledd 's point was it's a heck of a smaller, neater and more easily achieved hole without a connector on it. Making your physical routing choices to accommodate a connector is silly when it is so easy to crimp one on at the end but if that's no concern then no problem.
 
Don't think I can remove carpet strips without damaging carpet, as underside of carpet is fabric.

The underside of most carpets that aren’t foam/felt backed is hessian, it is hooked onto the teeth of the strip, you are very unlikely to damage it unless you have something with a sharp blade. The strip or bar is then screwed into the floor boards. To remove a flat headed screwdriver will lift the edge closest to the centre and from then it’s easily persuaded off the teeth. If you aren’t sure then 5 secconds looking at a photo of one should make it obvious.
 
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