The best thing to do if you can't hang the feeders where they can't get to them, is to create a feeding area away from your feeders just for them.
But here's a quicker solution to your probelm. Try using one of those suet feeders that have a cage around them so that just the birds can feed off of it. I have one and it works great. Even the Blue Birds have been eating off it lately (Peanut Suet).
