The protection provided by rule <SG11> applies to Placed Mobile Goals and Scored Rings. Rule <SC5> specifies that only one Mobile Goal may be considered Placed in each Corner.
If two goals are in a positive corner that is opposite of the alliance drivers station during the last 15 seconds and they want to remove one, can they ask a Scorekeeper which MG is considered placed? Should a Scorekeeper assist all / no teams?