floating shelves fixed on plasterboard

[jim55]

im moving into a new flat and want my av stuff on shelves under the tv (which im looking to wall mount ) now the wall in question is plasterboard (obv with wood studs behind it and in turn blocks behind that through the insulation),to get a good fixing could i screw a large board (say 6*4)onto the wall, screwed to the studs (thereby spreading the load )and fix the shelf brackets to this (and the tv in question )
i have a stud finder to find the wooden studs so i could fix the board properly to that using big wood screws and prob silicone round the edges for a neat finish ,but for the shelves would u reccomend toggle fixings that therfore go right through the wood (im thinking 18mm mdf painted,or if i can get it iv seen wall panelling whick is kinda like a sheet of marble ,but its just wood with a coating and u can get it in loads of colours -sparkly white and stuff -iv only seen this kinda stuff used on shower enclosures and stuff so im not sure how thick (and therefore suitable)this is )and through to the backside of the plasterboard,any thoughts on this ,is it a goer?
this obv isnt mine but something like this

 

[Pat "5mph"]

Apart from the fact that it look hideous do you know you have to ask the landlord permission before adding/altering fixtures and fittings?

 

[mr_cellophane]

Having your TV that high on the wall isn't good for your eyes, back or neck (unless you watch it standing up)

and that looks hideous

 

[berty bassett]

i would have thought that 18mm would be more than good enough especially if you could position it so maybe one set of shelf brackets hit the upright as well . also wouldnt have thought a few screw holes that could easily be filled would cause too much grievance if on long tenancy - though asking would be good idea
dolphin board ( its what we call it - think its right name ) is only 10 -12mm thick and hasnt got a finished edge - the ones we use haven't anyway - you have to use a plastic strip

 

[Globalti]

The OP knows how to use brackets.

 

[jim55]

tbh it wouldnt cause a lot ofdamage ,a few screw holes that are easily fixed and filled ,nothing major like ,i agree that tv is too high and mine is not gona b mounted anything like that height ,iv dabbled in av /good hifi over the years and set up is not too bad knowledge wise ,its just the building stuff /loadbearing i wasnt sure of

 

[jim55]

this is a btr picture