Mount help needed for loft wall

[ddoubleep]

I am looking to put a TV on the wall in my loft. The walls are your usual plaster board but when it was done I got the builders to put a wooden sheet behind so it reinforced it incase want to put something on the wall and drill through.

Can anyone recommend a suitable mount for a 43" TV? I want it to be flush on the wall. Just need basic adjustments when watching from the bed.

Would something like this be enough? or do I need dual arms like this ?

With the wood being behind the wall do I need any special screws or plugs?

Thanks

 

[ddoubleep]

The Hisense 43A7GQTUK is around 8KG according to online specs.
The way I understand it, the builders put a big sheet of wood to overlap the beams behind the plaster and not leave it hollow so a heavy item could be attached to the wall as made them aware where I wanted the socket and TV to go but still a bit conscious of getting the right bracket and screws so it doesn't rip the newly decorated walls down.