I was surprised there wasn't a Wii U mount for Skadis already available but I found the best wall mount I could and adapted it for Skadis. You can also use this for third party boards like Keepo. 

I printed at layer height 0.2 with 0.4mm nozzle with normal supports which went well.

Best way I found to install was to slide the Wii U in and adjust the front bracket until it lines up with pegs. Try to keep the front bracket as close to the front as possible because of the ventilation. 

There are two layouts for pegs on Skadis but I don't think it makes much a difference.