Hello
still we can not judge which solution you are looking for. Assuming we talk about EHSM solution: I am not awra of a "Best practise" document (samed as here: https://scn.sap.com/thread/3520481)
For second part. If we talk about EHSM then there is good chance to use it in S/4 Hana; Old solutions wil not be supported KEEP IN MIND: the whole SAP strategy for EHS/EHSM is still not final in context of S/4 Hana
C.B.