Congratulations on receiving the AVR. It’s a nice one. 2700 is a great value.
You may simply connect AVR to your Television and power it up and if you have a headphone and a 6.5mm adapter connect it and you can listen to music or even watch a movie until you get your speakers.
If your home is on a UPS and if you have good protection circuit built in you really don’t need a stabiliser. Alternatively if you are already using a voltage stabilizer which has high and low cut off use that for your AVR as well. I had done that previously and did not have any issues.
One more thing in reference to your last question, since your AVR is 2700, I think the Elac or the 3050i may not be the right fit as all these speakers need good power and the needs an amplifier with good damping factor to produce accurate bass.
The Platinum Achal’s are a great fit and are very easy to drive so it goes very well with the 2700. I used to have Denon 2600 pairs with ELAC’s earlier before shifting to Achal’s and was very happy with how it paired with Platinum Achal.
Just thought of sharing.
Regards,
Som