I thought i had replied yesterday but I can't find my post. Anyway, look at the pictures above, the wishbone is underneath the subframe so if the nut comes off the wishbone will come adrift. It doesn't matter which way up the bolts are so go ahead do it the easy way, they were probably only put in from the top in the factory for ease of assembly, cars are never made with easy servicing in mind. If you are at all nervous about your bolts put a dab of loctite on for extra peace of mind. Personally I wouldn't bother they ain't gonna come undone if youdo them up right in the first place.