wal_level = replica
max_wal_senders = 3
hot_standby = on

host replication postgres <slave IP address> md5

mkdir /data
chmod 700 data

pg_basebackup -D /data -h <Master_IP> --checkpoint=fast --xlog-method=stream -R

synchronous_standby_names = node1, node2, node3

application_name=node1

BEGIN;
SET synchronous_commit TO remote_write;
INSERT INTO tab VALUES <[...]>
COMMIT;

DELETE FROM data WHERE id < 4;

DELETE FROM data WHERE id = 1;
DELETE FROM data WHERE id = 2;
DELETE FROM data WHERE id = 3;