Are there any “passthrough router” or “DMZ router” setting on the Vodafone device? Some screenshots of UI of that router might give folks some clues as to what may be possible.
Most ISP routers have some method to connect your own router. In generally, you’d rather connect the Mikroitk to some ONT (e.g. fiber-to-ethernet box before router), but that’s not always possible, or at least not easily, see http://forum.mikrotik.com/t/bypassing-at-t-residential-gateways-with-mikrotik/135563/1 (but that’s for a US AT&T but similar contraption)
I think the hAPax3 be fine at that traffic level:
https://mikrotik.com/product/hap_ax3#fndtn-testresults
The “25 ip rules” is the one to look at. I generally looked at the 512 byte packet size number to be conservative, even though most packets would likely be ~1500 full frame,
On Wi-Fi performance of them…hopeful you’d get similar – but ax is new in the Mikrotik world, so that be my concern.