Just one last question everyone. Since I am very careful while working online and I rather have the approach that Prevention is Better than Cure, do I really need these online scanners? Since this is my gaming PC, I don't want to make it bloated by installing too much security softwares. Currently I have Malwarebytes, Zemana and Emsisoft Emergency Kit but I am thinking about uninstalling ZAM and MBAM. What are your opinions about this? If you do recommend a backup scanner, which one should I keep?
Having on-demand scanners won't hurt your system in any way as they have no real-time protection running in the background. These are primarily used to get a second opinion in the event you feel like something is wrong (ie: suspect malware) or just want to do a double check to ensure your system in clean. Since they don't run in the background, you can have as many or as little of them as you like. One thing you will have to answer for yourself is: do you plan on running them every so often to check your system, or would you rather only run them if you suspect something is wrong? There really is no right or wrong answer to that question, it will really come down to what you prefer to do. Personally I don't use any of them unless I feel like something is wrong, but that's me and my preference, others may prefer to scan their systems once a week and that's totally fine too.
Another option to consider if you want to keep them, but don't want to install them on your computer is to get portable versions of some of these scanners and store them on a USB stick. If you want to run a scan afterwards, just insert the USB and run them directly off the USB. Not all on-demand scanners have portable versions, but some examples are; Emsisoft Emergency Kit, Zemana and Norton Power Eraser (there are others, I just can't remember them all haha). All of these can be run directly off a USB stick (Zemana has a separate portable version that you have to download, but its the same product, just doesn't required an install).
In terms of which ones to recommend/use, they all have their strengths and weakness, some are stronger at catching certain malware, some are stronger at catching PUP's, etc. As I mentioned above since they don't run in the background, they won't cause any conflicts, so you can have as many of them as you like
Also you are absolutely right, as the old saying goes "An ounce of prevention is worth a pound of cure."