Hi lisage
Welcome to the forum 🙂
Make one copy of the rack card select it all and +Menu > Arrange > Group+
Click on the group and drag it holding down the option key (to make a copy) and shift key (to keep it parallel). Do again to make your third copy.
Position it using +Inspector > Metrics+
or
+Menu > Arrange > Distribute/Align Objects+
Centre the rack cards on page 1 and make another set centred on page 2. Print page 1, turn it over and feed back into the printer and print page 2.
Personal printers are not very accurate so you may have to carefully position the paper as you feed it and adjust the sides if they are not properly centred.
Peter