WonderbraWomen's Ultimate Strapless Bra

My normal size is 34c, what size would i need in this? As it says size up but is that back or cup or both?

Are these the new ones with silicone dots?

Is there an option to add straps to this bra? Are there hooks in place on the bra?

I'm using UK 36G what size can i buy and can i i return if it doesnt fit?