You are right. I soldered some unmounted OPA627s onto the included side-by-side board for use in the E12DIY.
I was so satisfied with it in my E12DIY, I purchased the pre-mounted BrownDog OPA627s for use in my CMOYBB.
Indeed, if you will use them I the E12DIY, you'll want to get unmounted chips and solder them to the included boards. I forgot about the height limitation in the E12DIY.
My apologies to anyone who may have been confused by that.