i was thinking of letting my son sleep in the net crib earlier as well, but when i was in the shop, the sales told me it will not be very good for the baby to really sleep in the net crib all the time solely as the support underneath the bed is not designed for sleeping for the whole time. The frame of the net crib i saw was like a cross, so there will be a lot of space which is not supported by the frame. But maybe that is only the one i was looking at. i think the most important thing is the bed has good support to the baby's back, whether it's a normally wooden bed or a net crib.
i use 木床 first but it broke when i move house so i just let her sleep in 網床
as long as u buy a good mattress is ok
some 網床 have another set put on it so is not that low ( better for your back ) the baby can sleep till 3 months as i remember after that just put mattress below