[Avodah] Kaddish with mixed seating

[Micha Berger via Avodah]

On Wed, Jun 24, 2015 at 11:33:54AM -0400, Kaganoff via Avodah wrote:
: We require separate seating for a *Devar she-Bikdusha.*

This is news to me. Do those who say that zimmun with a minyan is
a davar shebiqdushah (BY OC 199 "umah shekasav", MB s"q 15) require
separate seating at my shabbos table?

The AhS (200:6) refers to zimun with 10 as "shekhinta sharia", but
I didn't see him mention minyan or davar shebiqdushah.

Tir'u baTov!
-Micha