"Plagiarism has been around far longer than the Internet. In fact, I had a poem published in 'Seventeen' magazine when I was 15 years old. About a year later I was informed that there was a girl who used that same poem to win a statewide poetry competition in Alabama. It took months for people to put together that this had happened."
-Megan McCafferty

How Will I Know Who is Doing the Work?

Indeed, how do we know our face to face classes aren't cheating?

When is the last time on the 1st day of class you have asked for Photo IDs so you KNOW Susie Smith *is* "Susie"!? Even if you have done this, then how easy is it in this day and age of digital image manipulation to make or find a fake photo ID?! This is before we get to the Internet offering a trove of sites offering cheating "how tos" for in-person classes... Or for-hire rings that offer people to sit in the class for a student for the semester.

The point is that if someone is willing to direct enough time and or money at it, there is no such thing as a 100% cheating proof assessments -- online OR IN PERSON.

So we need to think in terms of assessments with reasonable safeguards built-in.

Safeguards for Plagiarism Resistant Courses:

Limit Use of Publishers' Multiple Choice Test Banks
Powered by the rise of online classes and heavy reliance on them for high stakes assessment, there is a thriving black market for national textbook publisher test banks. Limit any use of these to ONLY low-stakes, formative checks. This will significantly lower the incentive & risk to your course.
Establish a pattern of learning/work
Have a diverse and frequent assessment strategy to offer a pattern in multiple ways and monitor for consistency. (Happens to be QM Rubric Standards #3.4 & 3.5: 2018-QM RUBRIC )
Use Projects with Checkpoints for High Stakes Assessment
Designing a project with strategic checkpoints will allow you to monitor development of thinking/ progress and make it harder/less valuable for only having to pass off a black market purchased finished product.
Require Projects Utilize Local Places, Data or Sources
Incorporate some unique local element into assessments/projects that would not as easily lend themselves to be plagiarized as a generic project or have a large black market.
Other ideas Strategies to Make your Course Plagiarism Resistant

These all just happen to be best practices that increase student Success, motivation and significant learning that support many elements of the QM Rubric.