I can confirm E+ access works just like elite status for seating. Bought it for Mrs. PVDProf, and I can see E+ seats and position GM Master PVDProf next to her in E+ in her account, or in my account with her M+ number in the PNR.

It takes a couple days after purchasing E+ Access for it to show up on the site, or you can call right away for seats (or, at least the 1P line helped me get them into E+ seats using the Mrs.' access).