I have plenty of standoffs, the problem just comes from the case not having a hole in the right place where one of the standoffs should screw in. The motherboard still seems very secure with just the six standoffs though (I'm using the stock cpu fan and no graphics card, so there isn't a whole lot of weight) so I think it should be okay.
I think the problem may be because I have a micro ATX motherboard paired with a mid tower case. Though the case did say it was compatible with micro ATX, mini ATX and ATX. Who knows.