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I recommend2 certificates: the first in English Language and literature and the other in TEFL
1. A high band score in IELTS or TOEFL (for non-native Teachers)
2. A BA in English Language (and Literature)
3. CELTA
The students' result whom one has English language is the gauge to certify the teachers performance
1- TESOL
2-TEFL
3-CELTA
4-DELTA
5-PCELT
there are many Certificates such as:
TESOL =teaching English as second language
CELTA
PTP.
.
It depends on the purpose for which it is assigned.
My opinion: an educational establishment in which one is going to obtain some certification
should be accredited (or at least, recognised) in the country of interest
and have direct connection (contract) with a "native or mother" establishment in England (optionally - any reputable establishment in any English speaking country -US, India, etc.).