But best to inquire at the campsite you intend to stay beforehand, just to make sure they accept tents and have the toilets/showers available instead of only open for campers and caravans that bring their own.
Also, Staatsbosbeheer is not opening the "paalkampeerplekken" (pole camp sites, basically sanctioned wildcamping at specific spots for up to 3 tents), they will be closed for good. The other Staatsbosbeheer campsites as well as the NTKC campsites require prior reservation for the moment, even when you just have a small tent.