The phrase "based either on" is grammatically correct and can be used in written English.
Example context: The company's hiring decisions are based either on qualifications or on personal connections.
Our methods are based either on the one-center approach or on clustering procedures.
The armoury at your disposal is all based either on existing weapons and vehicles or ones currently in development – 2027 isn't that far away after all.
These algorithms are based either on blind or pilot-based estimation methods [38].
AIR allows developers to build stand-alone applications based either on Flash or HTML5.
All the clubs claim a link to the original Juventus, based either on colours, history and shared memory.
It could advise banks not to offer loans over a certain multiple (based either on income, or house value).
Most lawyers (like me) simply play their hunches, which are based either on shopworn stereotypes or on outright bias.
Passion music, musical setting of the suffering and Crucifixion of Christ, based either on biblical texts or poetic elaborations.
Colleges award financial aid based either on need or merit, which can be defined as anything from earning good grades to being a virtuoso cellist.
Whereas excises may be based either on quantities of the taxed product (specific excises) or on value, general sales taxes are inherently value-based taxes.
Compromised Cost-Time: Based either on workflows or workloads.
