Hi Mike,
The info below is from the VM Shop page.
"New customers: £30 network installation fee where QuickStart is unavailable. £10 monthly recurring service extension fee for the first additional box plus £5 monthly recurring service extension fee for any further boxes.
Existing customers adding TV: £30 network installation fee where QuickStart is unavailable. £10 monthly recurring service extension fee for the first additional box plus £5 monthly recurring service extension fee for any further boxes."
Unless VM have made a booboo and not updated their web pages then it's still £5 per month and not £7 per month for any additional boxes after the first additional box.
If you add a third box at a later date then you would have to pay the additional installation fee.
I can't comment on whether you'd be able to send output from one 360 to another TV as it's not supported by VM and I haven't seen any posts indicating that it's possible.
DaveI don't work for Virgin Media.
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