Take a look at the documentation at https://docs.chocolatey.org/en-us/choco/commands/install (or type choco install -? at the command line (you may want to pipe that to more or less).
You certainly can issue a list of packages at once and it will work fine.
Consider however that a packages.config file will give you a bit more flexibility in passing options and switches for each packages. Here is the format:
<?xml version="1.0" encoding="utf-8"?>
<packages>
<package id="apackage" />
<package id="anotherPackage" version="1.1" />
<package id="chocolateytestpackage" version="0.1" source="somelocation" />
<package id="alloptions" version="0.1.1"
source="https://somewhere/api/v2/" installArguments=""
packageParameters="" forceX86="false" allowMultipleVersions="false"
ignoreDependencies="false"
/>
</packages>
This will give you the ability to install multiple packages from one command.