Whether it's a power-strip or a picture, you can use this technique that I came up with one day. First put a piece of clear tape on the back of the object. With a permanent marker draw circles on the tape where the hangers should go.
Now take the tape off and put it on the wall where you want to hang the power strip. Level those holes first with a bubble level (especially for a picture). Now you can drill your hole right where the marks are for a perfect match. Pull off the tape and it's done.
To keep the tape from sticking too well, stick it to your clothes first, it will still stick good enough to the wall to do the job.
After getting frustrated doing things, I like to stop and think about how I could do them better. That's how I come up with my Grab Bag Tips
My tips will vary so stop by to see what I come up with next!
Please feel free to leave a comment and let me know how this works for you.
Sally's Grab Bag Blog