Roaming profiles

hi all 

i want to implement a new roaming GPO but i have a question abut ( enable roaming on primary computer ) 

if i assign group's in primary computer attribute on the domain (msDS-PrimaryComputer ) that mean the same user will have more than one primary computer this will effect the roaming GPO .

i work in a company that have a lot off users which they work also in shifts and they use every computer and im palning to delete profiles on non user primary computer ( the main case is my PC's Storage is full and i need roaming in same time )