Actually I think shooting them in the back is the best "angle". Most of the time a shot from the back will break a turkey down on the spot.
I think the biggest problem most folks have with shooting and recovering turkeys is that they don't realize that the vitals on them are all in the top 1/3 of the body.
Remember "high they die, low they go".....
I want my arrow to pass thru the center(front to back), and in the upper 1/3 of the body.... 1/4 away, hit slightly back from center....1/4 towards, slightly forward, try to slip it right behind the wingbutt.
Turkeys aren't put together like most animals we hunt where we try to hit them low in the chest.
Check this out....looks like there's a lot to hit on a big gobbler....
Now look what happens when you take away the non-vital breast meat and crop....
As you can see everything vital is up high.....
The bird in these pix from last years bird #2, was shot 1/4 away and the hole in the pix is the entry.
that shot went thru the front of the lungs and cut the front of the heart off.
Same shot a little higher would have broke his back...slightly, and I stress SLIGHTLY lower would
have still caught the very bottom of the lungs.
A little back would have gone thru the thighs and liver...and a little forward would have cut off the base of his neck.
Remember..."high the die, low they go"....