Virtual router security

[gareth_iowc]

I had an opportunity to move my server into a data centre that benefits me as I'm saving on electricity and the wife doesn't need to listen to the server anymore in the front room. 

I have a MikroTik CCR1036-8g-2s+ and a CCR1009-8G-1S connected using an EOIP tunnel and encrypted using IPsec. Both ends have a symmetrical 900 Mbps internet connection but due to the IPsec I can only push around 300mbps (full line speed with IPsec disabled)

Rather than keep throwing money at routers, I'm thinking of running Mikrotik's cloud-hosted router VM on my unraid server and passing a 10 GB fibre card. 

I know the main security would come down to my router config inside the VM but would there be any other vulnerabilities? It feels a little scary plugging the internet directly into my server.