I need a mobile ticket but was only offered a paper ticket? Is there a way to get a mobile ticket reservation?

I planned a journey from Paris to Barcelona for my family of 6 using rail planner app.  As advised I paid for seat reservations on eurorail.com.  Upon checkout I was advised that the tickets could only be posted out and that i needed to supply the address of my accomodation.   This seemed completely ancient to me but I reluctantly proceeded.  Despite the day of travel not being for another month, the accomodation agreed to accept and sign for the tickets when they arrive and hold them for me.  This was inconvenient to organise and I really don’t want to do it for all the places we will be travelling to throughout our trip, not to mention the hassle if something goes amiss.   2 hotels I approached about it said they hadn’t heard of it before.  Am I doing something wrong?  Thanks in advance