Post death rituals

I have to perform rites to my mother and in this lockdown period some prohits are suggesting to do this at my home itself from day 9 to 12.
Is this permitted. I have heard these rituals should not be done at home.

Similarly some prohits are recommending to do all days combined once the lockdown is lifted. I am not sure whether these are acceptable.

I would like your views
 
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