Multispinosa/Zebrina with discus and angels?

[illumnae]

Just a quick update, altum season came and I got myself a batch of atabapo baby altums to quarantine and grow out to keep with the discus, multispinosa and eartheaters. Figured that altums when fully grown would look awesome in a 4ft tall tank

 

[illumnae]

Finally I've moved in to my new place and the tank is filling as I'm typing this post. Quite a slow process as I'm using a 200gpd ro unit to fill the tank. Photo of it half filled attached. It looks pretty small, but I can confirm it's a 7 x 3 x 4 ft tank

Question on the multispinosa - what's the best way for me to get 2 nice ones in my tank? Should I get 5 and throw them into a grow out tank and let them fight it out till a pair forms? Or 5 straight into the display and hope a pair forms? Or just get any 2 into the display and hope for the best?