When placing hides to practice with your scent dog, it's very tempting to look for fun/interesting spots.  And if you are doing it for a fun, enjoyable activity for your dog there is nothing wrong with that!  But, if you are practicing for competition, it's a good idea to make sure to practice a variety of hide situations so your dog's practice is well rounded.  Some common ones include:

If you don't practice hides that are right at the start of your search area, your dog may learn that it isn't worth it to search the first part of the area and will rush in and start searching partway into the area.

I find this cue to be extremely helpful, and even more so when it becomes something a dog offers instead of say, jumping up on the kitchen counter.