The From the Back position will work with all types of anal toys. Most people will choose this position to explore dildos or other thrustable items because this position makes it easy to move the toy. However, butt plugs or other stationary toys can also be a fit here.
More about the From the Back Position
One of the biggest benefits of the From the Back position is its comfortable position, great for marathon sessions. Especially while lounging in a plush bed, the From the Back position can be held for a long time without quaking muscles. Add-in good neck support with a pillow (one made for spooning like the Lune could add bonus points) to make this masturbation sex position go even further.
The second biggest benefit is the natural position your body wants to take. By drawing the knees into the chest, it makes it much, much easier to hit the prostate. This partners with the natural angle your arm takes when folded behind you to pound the toy almost directly into the prostate. It's a bit of a "cheatsheet" for simple p-spot stimulation without needing to think about it!
Some people may find that they prefer to insert their toy before going into the From the Back position. Especially with longer toys, it can be difficult to get the distance from your body needed to insert a toy while in this position. Instead, you can lay on your back to insert the toy then slowly roll onto your side to move the toy once it's fully inserted.
The From the Back position leaves one hand free. The illustration shows the person lounging with their arm comfortably placed, but that free hand can also be used for additional pleasure! It can slide between the folded legs to provide clitoral, vaginal, or penile stimulation. While larger sex toys probably won't fit because of the curled up position, sex toys that don't need a lot of movement (or your hand!) will fit for most.