Extra box rent is £10 a month. Not sure what the activation is, but you would be looking around the £100 mark. The problem is the additional coax cable run you need. Virgin have suspended all but essential cabling work during lockdown, so you will be waiting a while.
You should also consider that new packages are likely to be on the Horizon (V360) rather than the TiVO platform. This can support either a master box with a single 1TB hard drive & 2 mini streaming boxes, or 2 hard drive boxes only to retain 2TB storage but you lose the third box..
Virgin BB TV Landline. Freeview/Freesat HD, Virgin Mobile, Tesco Mobile. Cable customer since 1993
I'm a Very Insightful Person, I'm here to share knowledge, I don't work for Virgin Media. Learn more
Have I helped? Click Mark as Helpful Answer or use Kudos to say thanks