we design devices with a cellular MIMO LTE system, a dual-band Wifi system, Bluetooth and GPS. We have M2.5 screws and nuts in the corners of the enclosure and PCB. The size of the printed circuit board is 133x78 mm. Is it possible to use SR4L049-L and SR4L049-R antennas on the PCB? Which of the three combinations is suitable for best performance? Because only the SR4L049-L antenna is in the stock everywhere, can only this type of the antenna be used, or is it better to have a pair of SR4L049-L and SR4L049-R? Or do you have any recommendations on how to solve the position of MIMO LTE antennas with fixing screws? Smaller holes on the PCB are not mandatory. We will use the R&S ZNLE device to tune the antennas.
Nut in enclosure: