We cannot have a separate link for each Book Now button on every page you have since the Book Now button is a global settings which means that it applies to all the pages.

But if you really want to have different link for each Book Now button, we can do it but not exactly what you have in mind.
We can have the Book Now button link to your Availability page or anything where we can put all the properties you have with separate booking buttons on each property listed on the page.

That way, we have achieved the goal of having different link for each book now button.