Challenges for Retrieving of SharePoint Documents??

I am using a WEB API code to upload a document into a SharePoint document library meantime am updating metadata columns and returning responses via JSON format that part is well and good.

while uploading a document am creating a folder structure with input parameters like the folder and document structure is as like below

Library Name/Parent Folder/Child Folder/Document.

even some more child/nested folder under parent folders.

My Manager Requested me to Check is there any challenges in future we may get problems while searching the documents. the conversation is as below.

I shared record storing we can store 3 crore records in SharePoint libraries or list.

https://support.office.com/en-us/article/Manage-large-lists-and-libraries-in-SharePoint-b8588dae-9387-48c2-9248-c24122f07c59?ui=en-US&rs=en-US&ad=US#__bkmktimewindow