It depends on the height. I dont know what their "limit" is, but above a certain height will require a specialist "heights" team that has the longer ladders, safety gear etc (H&S rules!).
So can be done but I am guessing getting the heights team appointment will be "trickier" - see what they say.
Have you got an install date booked yet ? If so contact the Pre-installation and delivery team on.. 0800 052 1734. and explain what is needed
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John
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I do not work for VM. My services: HD TV on VIP (+ Sky Sports & Movies & BT sport), x3 V6 boxes (1 wired, 1 WiFi, 1 on PA) Hub5 in modem mode with Apple Airport Extreme Router +2 Airport Express's. On 250Mbps, Talk Anytime Phone, x2 Mobile SIM only iPhones.