Depending on your security requirements and your Tableau growth curve, you've a few options. These alternatives have their pros and cons (and budgets) and it's up to you to make a trade off between these.
- Tableau Reader: lets your customers download Packaged Workbooks from your client portal.
- Tableau Public (Premium): lets your customers view dashboard online, possibly embedded in your client portal. Access cannot be restricted, but the download option can. (Tableau Public Goes Premium for Everyone; Expands Access to 10 Million Rows of Data | Tableau Software)
- Tableau Server on premise (not what you'd like)
- Tableau Server in Amazon Web Services: Tableau Server Now Available on AWS Marketplace | Tableau Software
- Tableau Server in Google Cloud: Deploying Tableau Server 9.0 (32-bit) on Google Cloud
Feel free to get in touch if you've any other questions.
Met vriendelijke groet,