Both Bosch units you mentioned need 208-240V service, but only draw about 12A each. This means you would need a regular conection usually used for a full sized dryer. Than you would need an electrician to split the socket into 2 sockets (so, make 1 into 2). This, for me, sound like a rather expensive option.
If you have the option of a usual 110V+240V laundry setup, but just not enough space, Miele or LGs compact laundry pairs would be the better option as their washers runs at 110V. Both dryers are air cooled condensation dryers.
If you have the space to put a fullsized unit at a permanent place, but only one 110V socket avaible, LGs full size combo would fit.
But if you only have room for a compact unit and it needs to be portable, you will be stuck with a combo. Again, I would recomend LGs combo as it offers the most features.
Any system would of course be expandable with those small 110V dryers to cut dow drying times.
A word on condesation drying: It is a lot of change.
1. Drying takes longer. About 2 hours on a full load. And combos take even longer.
2. Drying will get hotter. You might end up with a lot of shrunken clothes during the first weeks. But you can pretty well adapt if you learn which cycle is suitable for what kind of load.
3. Drying will heat up the space. With the aircooled stand-alone dryers, the heat together with minor amounts of moisture will vent into your living area. This means the set up place has to be verry well ventilated. And, during summer, drying will eventually take longer, or your AC (if there is one) has to work REALLY hard. With the watercooled combos, these problems are less extensive, but on the other hand, drying takes even longer.
4. Drying means more maintanamce. For example, the condenser of the aircooled dryers has to be cleaned about once a month. You have to take it out, put it in the tub\shower, rinse it down and put it back into the dryer.
If you got further questions, feel free to ask!