An excellent question, quite central to this thread, and very testable. So let's be scientists, and test it!If I cross the street, see a speeding car, faint out of fright, and get run over, terminating my existence, where is the mind dependency?
First of all, note that your question started with the word "if." This means you are asking a hypothetical question! Well, the mind dependence in a hypothetical question is completely obvious, you can't get anything more demonstrably mind dependent that something you are only imagining. Where are we to imagine this scenario you cite? In our minds, of course. So will our minds imagine precisely the same thing, as we discuss it? Of course not, if our minds differ, what we will be talking about must clearly also differ. So we have a very testable mind dependence, we need only be scientists and dig into it-- we can start asking ourselves questions like "what are we imagining here," including "what counts as a street," and "how fast does a car have to move to be called speeding," etc. When we do these observations, we will immediately discover the mind dependence, and voila, your question is answered.
Now, a more difficult question is, "when does the mind dependence matter?" That's more central to the issues of science, related to questions like "when does the gravity of the Sun matter when we are talking about falling objects on Earth," etc. Important scientific questions, helpful for unearthing all the devices we use to build an MDR. The beauty of recognizing the mind dependence is that it makes it easy for us to cope with issues like "when does it matter," whereas MIR believers are saddled with the problem that everything has to matter to the reality, if it is part of "what is really happening" in a mind independent sense. Only a mind can say "but that doesn't matter," and indeed we do, in mind-dependent ways, constantly.