It should work. The purpose of live rock is to give your tank more surface are so that more beneficial algae and denitrifying bacteria can grow. It is a crucial part of your filtration.
You have to be careful when purchase base rock or even live rock, because it's not always cured, and it can throw off your parameters. If you buy rock you can expect there to be some die off on the rock from transport, drying out etc. think of it kind of like throwing dead fish in your tank.
As an example, I make artificial live rock out of white cement, oyster shell and salt. When I first finish the rock (before it is cured in water) it makes the PH level go up to about 11.2. If you go and just chuck it into your tank, it's going to destroy it. It takes at least 8 weeks of separate curing and water changes before its good to go.
I think it's recommended to cure all live rock before putting them into your tank, better safe than sorry. If nothing else you could place them in some water for a week or so and monitor for any unwanted spikes. You'll know pretty quick if it needs longer. Just my 2 cents, not expert by any means