You don't need the server grade Mikrotik routerboard. I use a RB4011iGS+RM with all four Virgin hub LAN ports bonded together using balance-rr.
It has a choice of RJ45 GigE or 10GBe SFP+ outputs depending on your requirements. 1145Mbps out from Virgin on the 10GBe side.
Rock solid performer, has been up 24/7 all year and no issues whatsoever in the comms cupboard.
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