Naptime 2 Year Old Twins-help!

I haven't been here in awhile, so hi again!

Abby and Alyssa are now 2 as of Dec. 20th. They sleep in the same room in
toddler beds, across the room from each other. When it's naptime, they do
not stay in their beds and get up and giggle and play. I repeatedly walk in
and tell them it's naptime, remove all temptations (residual toys) but these
two entertain each other and don't need anyone else outside of their own
world (or so they think!).

They are in daycare 3 days out of the week and the owner (a friend of ours)
puts everyone down for a nap from 1-3. The girls each sleep in Pac n Plays
there, and I guess it is no problem. They do still need naps. If we skip a
nap, they fall asleep too early literally in their high chairs at
dinnertime...not only that, are not the easiest little girlies to be around
when they are cranky (as if I have to explain here!).

So any advice? They are my 4th and 5th children and I have never come
across this before. My eldest two are 15 months apart and when they were
this age, they both slept in the same room for awhile and it was not an
issue.

TIA!
Chele