Collect free night upon signup or 1st purchase?

I am looking for a hotel room for one night- August 9- in Paris, France.

I know there are hotel cards that include a free night upon first purchase or with minimal spending requirements.

Since I only have less than 2 months before my stay, I would need to collect my free night quickly.

Are there hotel cards that offer a free night with minimal requirements that do not require waiting until after your statement date to book and collect? (eg you can book your free night as soon as your purchase posts or as soon as you sign up)?

I would prefer saving Club Carlson for another trip because of the 3-for-2 night deal. I only need one night.

Any recommendations?

Thanks.