[1.20.4] Nice burning body, how to make an more logic burning block efect

This is a costume block whit the shape of a zombie is not a full block its flamable
when ignited  the flames just burn on top or by a aside 
that dint seems right 

	// ########## ########## ########## ##########
@Override
public int getFlammability(BlockState state, BlockGetter level, BlockPos pos, Direction direction)
{
    return 300;//((FireBlock)Blocks.FIRE).getBurnOdds(state); //300
}
	

it just seems like check to know if a fire block could despawn mi block 

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i want mi block to look more like this 

what could i use 

i was thinking on something like onNeigbourgChange() check for nearby fire or lava blocks  
then using the falling block entity spawn a fire block in the same position than mi dead body block 

thanks for your readings