Is there a consensus on how to install the M8N, specifically in regards to shielding? MRO recommends using cardboard with the original shield, but other install videos do not use cardboard. Is it recommended to use the "upgraded" shield from 3DR? Or is a 3D printed shield with copper tape the best bet? I have the M8N but it is losing GPS from time to time, and I would like to have the best GPS setup possible.