Did you order the biglycinate in the first link? That’s a good choice.
To help maximise absorption, try to to take on an empty stomach with soluble high strength vitamin c. Don’t eat or drink tea for an hour after and don’t take any other supplements at the same time.
The one linked is quite easy on stomach, but not an especially high dose. If you know you have low iron (ferritin), you could take two tablets a day but make sure you take them together rather than split the dose.