Corner mounts leave indentations on the corners of covers.
There are several cover albums available which are nice
I personally don't think Vario type page hold covers well. Cover are often too thick for them.
You can find 2 and 3 pocket pages are available at some sport card shops that are similar to the pages to hold baseball cards and will fit 3 ring binders. About 50 cents per page or less.
Scott makes cover size mounts for album pages.
Best place for Scott Mounts is at
www.globalstamps.com