Placing a bed

Hello! I want to create a block that place a bed at the same direction that the block face to put it in my structures. The problem is that a bed is made of 2 blocks. I can already make the bed face the right direction the problem is there i don't know how to place a bed that have the block state "part" (this blockstate define if its the head or the foot of the bed) set in "head". I try nbt tag but i think that its not the right way: https://ibb.co/z6TJDN7. There is a way to spawn a complete bed with function but i don't know how to make the function get the rotation and the position of the block that spawn the bed. 

Thanks in advance