How close together can I put two drywall anchors?
I love those anchors and use them all the time. Don't bother trying to patch the hole and re drilling it, the patch won't hold. Leave the old anchors in the wall and install a new one an inch or so to the right or left of the old one. Then measure the distance between the keyholes, center to center, and measure that distance from the center of your new anchor to where the next one has to go. Drill a small hole at that point, don't use the "drill point" on the anchor as they can shift when screwing them in. Screw in the new anchor and you should be good to go. You can now go back and remove the old anchors and patch the wall or just leave them there. Good luck.