Placement/location of pull-up/pull-down resistor?
Ideally, there should no apparent difference, but I always put this "guard" resistor close to the pin which it will guard. There are two reasons:


If you put the pull-down resistor close to your MCU, and have a long long trace from your MCU to the converter. If your converter's enable pin will source some current, the current will flow through the long trace and your pull-down resistor to ground. If the trace impedance is high, your converter may see a high level at the enable pin! Whatever, it will reduce your noise margin.
If your MCU is far from your converter, put the resistor close to the converter will make the circuit more clear. And once you have problem with your board, this will make the debugging work easier.