as a way of encouraging good behaviour? It never seemed to work for my DC. I found firm but fair, limited screen time and lots of love an attention was the way to go.
Praising good behaviour was a sure fire way to have that behaviour end.
e.g. "Beautiful table manners DS1" was sure to mean exaggerated open mouthed chewing within seconds
"Lovely to see you playing so nicely together" would mean one of them was about to get kicked
"Good effort on your handwriting DS2" would immediately be the end of any focus on the homework.
Just my DC?