Hi poppyone,
As you know I think highly of Texas Mattress Makers and I think you made some good quality/value choices.
Congratulations on your new mattresses 
If you mean a standard steel bedframe like some of the ones mentioned here … then you would also need a foundation to support the mattress because the bedframe by itself isn’t meant to use directly under a mattress.
[quote]Mine is on a wooden slat frame (that is attached to a head and foot board).
Is there a certain number of slats we should look at and is the metal frame ok.[/quote]
If you have a wooden bedframe with 5 slats or so then it would be designed to be used with a foundation or box spring.
If you have a platform bedframe that is designed to be used directly under a mattress without a foundation then Texas Mattress Makers will be able to tell you if it meets the warranty requirements for the mattress you purchased and if it doesn’t then they also sell a foundation that would be suitable as well.
There is also more about the different types of support systems that are generally suitable for different types of mattresses in the foundation post here (and the posts it links to in the second paragraph) but if you need a foundation for your mattress then the simplest approach would generally be to order the foundation or box spring that is supplied by the manufacturer and is designed to go with your mattress.
Phoenix