Thanks for the quick reply, Novie. I did the search(es) you suggested and found just what you mentioned. Most popular brands of pressure canners state that "Pressure Cooker/Canners are NOT suitable for glass/flat top ranges."
Stove manufacturers do not recommend canning because of what you said about heat being trapped under a pot exceeding the burner size, which can cause serious damage or crack the top.
Looks like it's going to be another coil burner for me. Boo hoo.