I did asked support when I can send them my own miners. They responded Late March or early April. I don't see why I can't send them my own miners NOW since I can rent my WTT tokens & NOT all of my WTT tokens being utilised as I am writing.
They have a long waiting list for the current customers with miners bought from Giga-Watt, so they don't accept other miners. They plan to finish deployment of the queue somewhere in March i think, and after this will resume accepting other miners.