Hi Jackbauer,
Both of them use courier services for delivery to significantly reduce the shipping cost and the customer would put the layers together inside the cover (which is a fairly simple process). The couriers don’t offer white glove service. You would need to talk with them to find out if they can provide white glove service through a common carrier as an option and if they can, the cost that would be involved in shipping to your area.
A latex mattress generally does best on a solid non flexing slatted foundation or platform base with no more than 3" of space (preferably less) between the slats. A flexing box spring with springs (assuming that’s what you have) isn’t normally the best choice for a latex mattress unless it’s been specifically designed as part of the sleeping system. The bottom of a box spring wouldn’t be suitable. There is more about foundations for latex mattresses in the foundation post here.
Phoenix