the net doesn't hold them down.. well it can for the ones growing tall.. .you weave those until the other stuff catches up. The screen will provide support for limbs as much as it organizes your canopy.
so, stuff should go through it.. taller stuff should weave until it evens out -- plus you get some auxiliar growth from that horizontal shoot -- try to think about where you train things and where your canopy needs more density etc etc...
you can just have them pop through or twist-tie them to a section etc... whatever works best for the situation.
a second net later on and further up, if you care to do it, can help with floppier plants. i wouldn't do it for any other reason.