Well I have them mounted on my home hAP ac3. So I can test the wifi performance (see other posts). They are big, but not in performance. Actually not even omnidirectional for the 5GHz band http://forum.mikrotik.com/t/hap-ax3-wireless-problem/172468/1 either.
Their flat design makes them directional for 5GHz, not great for indoor use.
On Amazon , with a search for “wifi rubber duck antenna” , one can find stronger gain, round design, but also short ones, cheaper than 50ohm stubs.
(via TEMU here for less than 2€ ,including home delivery)
Interesting price evolutions also for USB based SSD drives (with cell wear levelling), as cheap as USB memory sticks these days.
For User Manager database and Docker container storage.