This all depends on the limitation of your website. For example, my blog limits me to 800 px wide, so in order to embed a workbook, I have to make sure my dashboards are no wider than 800 px. But your website could have different limitations. Understand those limitations and adjust accordingly. By accounting for the maximum width on the site, you'll be able to avoid scrollbars.
It seems that you posted the same question twice.
So I'd like to lock the previous one.
And welcome for more experience in this post.
Any further questions on this, Naveen?