Fixed assets capitalization for a same item installed on different dates

Dear team,

I have a scenario where i would need your help.The scenario is below

My client deals with POS machines purchase and installation

He procures POS in bulk say 1000 nos and give a date schedule to the Vendor on which dates these to be delivered partly. subsequent to this vendor will send a Bill for all the 1000 nos and payment will be processed.

Now each ATM is an asset and installation happens on different dates. Now my  client wants to capture the Installation date as the capitalization date for each POS. not the Purchase date.

please suggest me on how to handle this?

Regards

Abuthahir