Moving Cross Traffic Radar Units 1/4"

[Jethro71]

I there any reason why I can't or shouldn't move my cross traffic radar units back about 1/4"?  They are mounted right behind the step in the bumper and I need them to be set back about 1/4" or so to make room for some bumper lights that I'm installing.  I was thinking about putting a 1/4" spacer between the mounting bracket and where it attaches to set it back a little.  Would moving them back 1/4" affect how they should function?