Selling ZOHO apps to third party customers.

Selling ZOHO apps to third party customers.

So excuse me for the long read but I'm a bit confused.
First the introduction, I work for a company that specializes in developing business solutions to small businesses and we've decided to use ZOHO creator because it seems ideal for some of our use cases. Our first idea was to purchase the Creator Ultimate tier membership and develop each app in our account and give access to each client. From what I gathered this is not permitted because the Creator account is only for your only company, you have to go through instead.

So what's the correct and most efficient way to do that?
Make a ZOHO creator for each client and develop the apps he needs inside his account?
Make Apps, upload them to marketplace and tell each client to install them into their ZOHO account?
Using SaaS? (I don't know how the pricing and access model for Solutions works, if you could point me to some articles about it it would be very helpful)

Also does the client needs to log through ZOHO to access his apps or I can give them a direct link? Can this link be different than through a different pricing model or the client and his company's employees must always log through ZOHO to access the apps?

I'm sorry for the long pots, thanks in advance!

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