Bought a few different angled connectors power supply cables to fit the power supply beneath my pedalboard, and these managed to secure their stay by working well and having the apropriate length for my Pedaltrain Metro 16.
However, I *did* find it odd how every other supply cable I've tried fit perfectly on the pedals, and these seem to stick out just a bit in every connection. Not really a problem, it's just an OCD thing of worrying if everything is really ok... But alas, not a problem after about a month, so I'm satisfied.