Auto flowering and lst

I have a 60x60x160cm grow tent ,250w hps .I was wondering if it is a good idea to lst my 3 autos(x2 super lemon haze auto,x1 speed bud) because i got free space in my tent(i will harvest speed bud 3-4 weeks sooner), rather than not lst them and let unusuable free space. What do you think?

the lemon should be ok to be lstd.wouldn't do it with the speed bud though.