Double Belting

Hi all,

I am in the process of building an OX cnc and I have got the the stage of running the belts.
I am going to be double belting it. Now for my question
With the two belts in the channel it doesn't leave alot of room for the upside down T nut.
For those you are running double belts did you use the upside down T nut or some other method to hold the belts in there?
Thank you
Nathan