In reply to Nao: TBH if it is vertical it isn't going to be much use for anything and won't help for stamina. It needs to be 15 to 45 degrees overhanging. I know, I built a vertical one and very soon it was useless. Even using little crimps to make it harder made little difference. The only work out I managed to get was dry tooling with leashless tools on Pocketz holds from www.holdz.co.uk.
Honestly take my word for it, build it overhanging or don't bother. It will be a waste of time effort and money otherwise. I spend ages building mine and it was just that. It doesn't take much more effort to build a small frame to make it overhanging.
FWIW I had Metolius, Entreprises, Moon and Holdz holds on my wall. My favourites were the ones from Holdz.