Managing a large Solo-Stake investment of Ethereum with no technical experience. Any tips or recommendations?

As the title says, I will soon be responsible for managing a Solo-Stake investment of a few million in Ethereum for the company I work at.

I’m a rather new employee but by far the youngest with no else having any technical expertise, me included.

The company has had a large investment in Ethereum for some time to my understanding, but now wants to take advantage of the rewards offered by staking. The natural choice due to our lack of technical talent would have been Staking-as-a-Service, but Celsius’ asset freezing scared them off from that.

So we are now looking to set up these stakes ourselves and it looks like I’m the one to manage it. Problem is I’m extremely new to crypto, have zero software or hardware expertise, and am very concerned about messing up and losing money on the investment.

So I’m just coming to the Ethereum community to see if you have any tips or recommendations on how to learn everything I’ll need to know to setup and manage this. As well as answer a few additional questions I have below:

How many nodes can you have per device? We are going to have several hundred going by the 32 Ether per node.

Does having multiple nodes per device negatively affect our nodes in any way?

How important is it to have the optimal computer hardware requirements and why is that important?

Is there any sort of consensus on confidence intervals for the Shanghai update? We have concerns around a long term liquidity lockup.

How much maintenance and time will managing the nodes require?

How do I ensure the safety and security of our wallet? We are aware of things like the DAO event and Axies Infinity hack, and want to protect ourselves against such attacks.