Normally the dish, or raised edge if you like, faces away from the drive mechanism, whether belt or chain.
Methinks that is to prevent a sharp edge that may catch on the belt/chain, causing an awful sound and trashing of bits
The slinger, as the name suggests, throws oil away at a tangent from the crank shaft, to make life a wee bit easier for the timing cover crankshaft seal.
Probably helps to lube the chain as well.
Wrong way round, as mentioned, there may be a clashing of metal and mincing of the slinger.
That would depend on the clearance of course between the slinger and the chain.
Without it, the front seal may have a hard time and weep about it all