Is 2 different idols of same god be kept for thiruvaradhana?
Bhaghavatha can keep many of the same/similar perumal vigrahams in pooja room. What adiyean understand is that for thiruaradhana, the amount of prasadams, etc., to be increased in proportion to the size of Vigraham and that’s why there is a height limitation/restriction for idols/vigrahams keeping at home pooja.
Another one is Devaki’s krishna. You can assume…!!
Bhaghavan is countless- So, numbers is meaningless in the case of Bhaghavan.
But, having one or many is not the case… what is more important is how we keep our child Krishna is most matters… Take great care of Him…..
We know during Rasa lila He manifested multiple Himself simultaneously and danced with each of the Gopis.
During the Brahma-vimohana lila He manifested Himself as multiple Gopas and went each of their households for one full year.
Can we assume, during makkan-chor lila He can do the same and steal butter from different households at the same time? Only acharyas can confirm what He did and what He did not!
In any case, you please offer Him sufficient; otherwise eatables may start disappearing from your neighbours houses!
On a more serious note: Please check with your acharyan-swamy or the person who trained you in Thiruvaradhanam.