I saw in Logical Systems Overview documentation that starting in Junos OS Release 18.3R1, an SRX Series device running logical systems or tenant systems includes three licenses by default. One license for a master logical system and the other two licenses for user-defined logical system or tenant system. But I can't find any information if SRX Branch models support this default logical systems. Where I can find this information?
Only high-end SRX have supported logical systems:
Both Logical Systems and Tenant Systems are supported only on SRX High-End Series devices.
Please find the following technical documentation from Juniper:
From the above technical documentation, below the heading, you will find "Platform and Release Support", if you click that it will list the SRX series devices that are supported for that particular feature.