can i use single rank and dual rank ecc ram (of the same size) in the same channel ?

i currently have synology nas with 2X2 gb ecc udimm Single Rank (on the same channel)
and single 8gb ecc udimm Single Rank on another channel (i think from my understanding that all of them at…

can i use single rank and dual rank ecc ram (of the same size) in the same channel ?

Source: [H]ardOCP – can i use single rank and dual rank ecc ram (of the same size) in the same channel ?