SM7B with a Klark Teknik CT 1 on an Audient EVO 4: does the cheap booster do the job?
Yes. With the Mic Booster CT 1 already in line, the EVO 4 only has to supply about 34 dB of the 58 it publishes. About 24 dB of interface gain is still unused.
The hard gain is already done. The Klark Teknik Mic Booster CT 1 sits in front of the Audient EVO 4, so the interface preamp is no longer the thing that has to rescue a quiet microphone.
Shure rates the SM7B at -59.0 dBV/Pa, the voltage from a loud 94 dB tone at the grille. A speaking voice is closer to 85 dB, so the preamp still has to find about 34 dB to land near −9 dBV. That −9 dBV figure is just a tracking level: high enough to use, with space before the converter clips.
Feed the interface from the booster's output and do not stack a second microphone preamp on top. Most inline boosters spend the 48 V themselves. That is fine for a dynamic. If this microphone is a condenser, read the booster's manual before you leave it in the chain: if it does not pass phantom, the capsule goes silent.