The prescription for FAR clause 52.217-6 at FAR 17.208(d) states this clause is used when "the option quantity is expressed as a percentage of the basic contract quantity or as an additional quantity of a specific line item." FAR Clause 52.217-7 can be used to buy optional quantities, but the nomenclature of that option CLIN must be the same as another line item that is not an option. Since there will be five CLINs, each for the different laptop package configurations, and assuming each CLIN will have a different nomenclature, the use of FAR clause 52.217-7 would require corresponding option CLINs to the base five CLINs that have matching nomenclatures. 

FAR 17.204(f) is helpful as it states how contracts may express options for increased quantities. What makes the most sense in terms of contract administration, to include contractor billing and payment? If 52.217-6 is chosen, then that would mean increasing the quantities for specfic CLINs. If 52.216-7 is chosen, then separate CLINs would have to be created that share the same nomenclature as the base CLINs.