I have a 3D printed sight with a tube on top, but if the LabRadar beam is off center from the face, that doesn't help much. When I get time, I will drag mine back to the 50 foot indoor range and try again with an SD card so I can monitor the SNR. I really need to fix more pistols, not become an expert on the idiosyncrasies of my chronographs...
I've ordered another HT-X3006, but with the Wi-Fi option so I can collect long strings of data and get them into a spreadsheet more easily. I may try to put the two in series to see if they read the same on a given shot. That would give me more confidence that they are working well. It will take a few weeks to get here from China, but that gives me time to 3D print a bracket to hold a pair. I will test them with one of the Hammerli pistols that showed very small velocity variations.
Given that I apparently can't use the LabRadar in my basement shop, it has VERY limited utility for me. Between the Garmin, the FX, the Athlon and the LabRadar LX, there are quite a few options for small radars with wider beams. I have yet to hear anyone bad mouth the Garmin, and it sounds like a few people have had success with one at short range indoors. The LX and Athlon are both so new that there's very little real info, especially for my use case.