Regarding the position of the resistance between the CE poles of the transistor.

There is a problem with the circuit. The circuit on the left is an emitter follower, but it lacks DC bias, input capacitance and output capacitance (without these components, this circuit has no meaning). The circuit on the right is divided into two cases. Level conversion should be connected to the B pole of Q2 with a resistor to ground or a negative power supply; the second is as an amplifier circuit, which should be a common emission amplifier circuit, but lacks DC bias and feedback resistors, input capacitors and output capacitors.

How to say this question. An electrolytic capacitor should be connected in parallel to the circuit R3 on the left, which needs to raise the E pole voltage of Q1, which is mostly used for small signal amplification; while the circuit on the right is used for level conversion. The purpose is different.

For the problem of level conversion, the above is generally low potential, and vice versa.