I went with the white high gloss LINNMON desk top because of the width needed to be able to support laptops back to back, and at 29 1/2 inches it gave me just that.
I added the ALEX drawers in the front for both a closed off front and for much needed storage of office items. Initially intended to fill gap between drawers, but liked the little gap and might be useful if I put a lamp there in the future. The height was also just right (tried using KALLAX shelving unit with/without top and height was an issue). I attached the LINNMON to the ALEX by simply using extra strong / thick 2 sided tape.
Using OLOV adjustable legs to match the height of the ALEX drawers and give some metal to the desk (matching other chrome parts of the office). I placed a white board in the back to close off the desk and provide an area for power cords to hide behind. I attached my docking station to the white back board, to get my laptop out of the way and use a cordless keyboard/mouse giving me flexibility to push things out of the way if space is needed.
Finally for cable management, I added the SIGNUM underneath, and drilled a hole in the center of the desk and added a white grommet cover to keep the cables from falling through.
The biggest challenge was getting something to fit in the space and be the right height along with my requirements: dual desk, storage, durable (one of my kids is nicknamed the destroyer), modern looking, and ability to hide cables. I went through a few renditions including KALLAX shelving for the front. It turned out perfect, and would be fairly easy and cheap to replace the LINNMON desktop if needed (destroyer).