Whilst I agree with @Tudor on this, it is worth knowing that if you connect your own router then you will be constrained by the 940 Mbps port speed of the Hub 4's ethernet ports, so against an expected speed of 1140 Mbps you'll only ever be able to access 82% of it. If you leave the Hub 4 in router mode and add an access point that would still be 940 Mbps constrained but you'd theoretically be able to utilise the remaining 200 Mbps via the other ports on the Hub 4.
Speaking as somebody who probably never maxes out a 200 Mbps connection I can't see this being a hardship, but YMMV.
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I use all Ubiquiti/Unifi kit, router is USG 4 Pro (it’s just a proper router, nothing else), 2 x WAP AC Pro’s (one upstairs, one downstairs), 3 x PoE network switches, CloudKey 2+ and 4 x Unifi cameras. Plus 5 x Raspberry Pi, 2 running Pi-Hole, 1 print server, 1 garden watering system and 1 FlightRadar ADS-B receiver.
Tudor There are 10 types of people: those who understand binary and those who don't and F people out of 10 who do not understand hexadecimal c1a2a285948293859940d9a49385a2