Yes, I have looked through KBA-97095 but it seems to cover chip antennas. Will the same apply to trace antennas?
Your question is not clear. Will the radiating open end of the antenna face the wall? If yes, then the device may not provide the best RF performance. Ideally, the radiation pattern of the trace antenna should be checked. The antenna could have anisotropic radiation pattern and it should be oriented in free space along the direction of maximum gain. Regarding the antenna clearance, if you have made provision for keep-out area as per the module datasheet in addition to the 10mm clearance, this should be sufficient.