I have always drilled 2 holes in the scratchplate to mount the humbucker, but I have also seen people add a surround too. I never had a problem with no surround. I think too much is made of string spacing. Nearly all the orginal pickups had the same neck and bridge spacing, so one is always off. I don't think there will be a problem at all, and also this is a neck position you are putting it in, so the strings will already be closer together.