I had interference problems with a floodlight I installed centered above the outside of my garage door. Door opener worked fine with the power off, but very limited range when I turned the power on to the floodlight / camera.
I finally found a solution using ferrite noise suppressors on all the wires going into the garage door opener.
Ceedmon 20 Pieces Clip-on Ferrite… Amazon.com
I started by clipping these ferrite cores over the sensor wires, push button switch wires and the incoming power cable, just as they go into the door opener. This provided marginal improvement. However, when I looped the base of the opener antenna wire around one of the ferrite cores, the door opener range returned to normal.
Hope this helps.