Vivomounts 77" 16:9 Screen on Amazon

[Porschecraig]

I am about to take the plunge and order myself an Optoma HD65 pj. After reading much about it in here, i feel it would be the best projector for my money.

However like many people in here, i have a dilema over the screen. I live in a flat which has patio doors leading on to a balcony and i was looking to put an electric screen in front of them. I am on a budget but also have a few hundred quid Amazon gift vouchers to spend. I am going to buy the pj from Dixons but i was hoping to use my Amazon vouchers to buy a screen. The only suitable sized screen on Amazon is the Vivomounts for £100. However the big issue i have is trying to find out what the top border size is. I have done all my maths for positioning the pj on the ceiling and i have worked that i need a top border on the screen of around 40-50cm to drop it down a little. This is due to hanging lights already fitted on the ceilling which i have to over-come to keep my other half happy! Removal of the lights would be ideal but it is a no-go, this is my compromise!

Does anyone out there know the max top black border size of this screen??? I have searched the web everywhere, emailed the suppliers etc but with no avail!! Please Please can someone help as it is holding me back from hitting the buttons to order everything!!!