Make sure to test the cables before installing them. Making Ethernet cables is easy with a box of bulk Category 5e Ethernet cable and RJ connectors that are attached to the cut ends of your preferred cable length. And once you have that established, you can actually place the modem and router anywhere you like. There are two kinds of Ethernet cables you can make, Straight Through and Crossover. Pulling the cable down to the outlet opening can be especially difficult if there is insulation in the wall where you are pulling the cable. Is this article up to date?
How many cables are terminated in that closet?
Connecting apartment ethernet jacks
How can we make it better? There aren't any electrical outlets in that closet. A view from the top. Also note how the wires go all the way to the end. You want to be sure you properly wire your ethernet cables as well.