No, no, no, you MUST not assume that.
Read the submittal policies. DO NOT SUBMIT RELATED SITES. Remember that sites are related if they are related to the same commercial entity. Remember what penalty is given for violating that policy. That is the most severe penalty mentioned in the submittal policy!
Do not assume what you want to assume. Do NOT submit subdomains, subdirectories, or even parts of the company's website that are on other domains. They are ALL considered "related." And they all come under the absolute prohibition in the submittal policy.
Repeat: SUBMIT ONLY the main page.
But (these are the details answering your general question, but not applying at all to how or where you may submit without being regarded as a spammer) do NOT be surprised if in some circumstances NOT related to yours, editors choose to deeplink the websites of some manufacturing companies.