Traditional ETA approach is about searching and running a single business. Now, in case of several attractive targets available it might be worth considering to acquire several business (from different industries with no clear synergies) and run that as a portfolio.

I do understand the big risk of diluting the focus but maybe someone has some experience based best practices around the topic?

There are lots of examples. Most start with just one though and then branch out into additional, whether that be bolt ons, roll ups, or portfolio. One of them many investors I’ve spoken to over the last year actually had a plan to buy two businesses at once, ended up only closing on the smaller and then came back and bought the larger in a “minnow swallows whale” situation. My advice would be to either do one at a time or have a very experienced set of investors/advisory board before trying this. Best of luck!