Dual rod holder for samla drybox

Looking through the samla drybox designs, I don't really like either of them: I don't want to print directly from the box, so I want the fillaments to be easy to remove.
Also, I prefer not to drill the box, so I designed something that can be glued into the box. I'm not sure how sturdy it turns out to be though.

The rods are 15mm diameter, and 325mm length. However, the length depends on the installation, so I recommend to measure after installing the holders.

It's not on the picture, but