Extension boxes are great.

You can get them cheaply from CPC.

I also use them to make very neat data and A/V distribution boards in
my home office.

I use two MDF veneered boards sandwiched together. The top one has
holes cut which take the extension box, while the lower board has
grooves routed in it to act as cable channels. The network outlet
fittings simply screw to the extension box and the finished result is
very smart.