@kitenski 

If you ever need to contact your ISP about Internet link issues, you'll be glad to have Virgin Media v5 Hub in its default gateway mode. Put Hub in modem mode, use main Deco as a router - and your escalations to ISP Support could get dismissed with "third party router hardware - not our issue."

Also, in Deco Access Point mode you could use all Hub Ethernet ports. 

If you have extensive wired network at your home, you don't need to pass its traffic through Main Deco - you can connect your main networking switch directly to Hub, for better performance.